Berlin 2008 – wissenschaftliches Programm
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SYEC: Symposium Exact-exchange and hybrid functionals meet quasiparticle energy calculations
SYEC 3: Exact-exchange and hybrid functionals meet quasiparticle energy calculations III - Poster (joined by SYMS posters)
SYEC 3.5: Poster
Donnerstag, 28. Februar 2008, 18:30–19:30, Poster F
Two-particle excitations within the Hubbard model — Berlinson Dominikus Napitu1,2 and •Jamal Berakdar2 — 1Martin-Luther-Universität, Halle-Wittenberg,Germany — 2Max-Planck-Institut für MikrostrukturPhysik, Halle
Remarkable progress has been achieved recently in studying experimentally the two-particle spectrum of surfaces via angular and energy-resolved two-electron emission upon [1,2] a single-photon absorption. We show in this theoretical contribution how these measurements correlate with the particle-particle Green’s function and contrast with related spectroscopies such as core-valence-valence (CVV) Auger spectra and appearance potential spectroscopy (APS). Based on the single band Hubbard model [3] we developed a method for the calculations of the corresponding two-particle spectra while the single particle properties are being evaluated within dynamical-mean field theory (DMFT)scheme [4].
[1] Schumann, F.O., Winkler, C., Kirschner, J., Phys. Rev. Lett. 98, 257604( 2007); [2] Schumann, F.O., Winkler, C., Kirschner, J., New. Jour. Phys. 9.372/1-14 (2007); [3] Hubbard, J.I., Proc. Roy. Soc. London 276, 238 (1963); [4] Georges, A., et al., Rev. Mod. Phys.68, 13 (1996).